OrientDB is an Open Source Multi-Model NoSQL DBMS with the support of Native Graphs, Documents, Full-Text search, Reactivity, Geo-Spatial and Object Oriented concepts. It's written in Java and it's amazingly fast. No expensive run-time JOINs, connections are managed as persistent pointers between records. You can traverse thousands of records in no time. Supports schema-less, schema-full and schema-mixed modes. Has a strong security profiling system based on user, roles and predicate security and supports SQL amongst the query languages. Thanks to the SQL layer it's straightforward to use for people skilled in the Relational world.

Get started with OrientDB | OrientDB Community Group | Dev Updates | Community Chat .

No. OrientDB adheres to the NoSQL movement even though it supports ACID Transactions and SQL as query language. In this way it's easy to start using it without having to learn too much new stuff.

Yes. OrientDB is totally written in Java and can run on any platform without configuration and installation. Do you develop with a language different than Java? No problem, look at the Programming Language Binding.

• Documentation Version < 3.2.x
• For any questions visit the OrientDB Community Group

Get started with OrientDB.

For the guide to contributing to OrientDB checkout the CONTRIBUTING.MD

All the contribution are considered licensed under Apache-2 license if not stated otherwise.

OrientDB is licensed by OrientDB LTD under the Apache 2 license. OrientDB relies on the following 3rd party libraries, which are compatible with the Apache license:

• Javamail: CDDL license (http://www.oracle.com/technetwork/java/faq-135477.html)
• java persistence 2.0: CDDL license
• JNA: Apache 2 (https://github.com/twall/jna/blob/master/LICENSE)
• Hibernate JPA 2.0 API: Eclipse Distribution License 1.0
• ASM: OW2

References:

• Apache 2 license (Apache2): http://www.apache.org/licenses/LICENSE-2.0.html

• Common Development and Distribution License (CDDL-1.0): http://opensource.org/licenses/CDDL-1.0

• Eclipse Distribution License (EDL-1.0): http://www.eclipse.org/org/documents/edl-v10.php (http://www.eclipse.org/org/documents/edl-v10.php)

Recent architecture re-factoring and improvements are described in our BICOD 2021 paper:

@inproceedings{DBLP:conf/bncod/0001DLT21,
  author    = {Daniel Ritter and
               Luigi Dell'Aquila and
               Andrii Lomakin and
               Emanuele Tagliaferri},
  title     = {OrientDB: {A} NoSQL, Open Source {MMDMS}},
  booktitle = {Proceedings of the The British International Conference on Databases
               2021, London, United Kingdom, March 28, 2022},
  series    = {{CEUR} Workshop Proceedings},
  volume    = {3163},
  pages     = {10--19},
  publisher = {CEUR-WS.org},
  year      = {2021}
}